Defoaming device for lithium iron black powder leaching process

Abstract

The utility model discloses a defoaming device for a lithium iron black powder leaching process. The defoaming device comprises a reaction kettle, a spraying assembly and a cooling water assembly, the spraying assembly comprises a spraying mechanism and a liquid supply mechanism, the spraying mechanism is arranged at the top of the inner side of the reaction kettle and is used for spraying defoaming feed liquid, and a discharge port of the liquid supply mechanism is connected with a feed port of the spraying mechanism and is used for pressurizing and supplying the feed liquid; the cooling water assembly is arranged on the inner side of the reaction kettle and is used for injecting cooling water. According to the defoaming device for the iron lithium black powder leaching process, the spraying assembly and the cooling water assembly are arranged in the reaction kettle, under the condition that the reaction is violent, reaction heat is reduced, meanwhile, chemical defoaming is carried out on feed liquid subjected to covering type spraying defoaming, and the reaction efficiency is improved. The device efficiently solves the bubbling phenomenon caused by reaction heat and gas generated in the reaction process of the waste lithium iron phosphate black powder, is suitable for treating different types of waste lithium batteries, and is good in operation environment, high in applicability and small in occupied area.

Description

Technical Field

[0001] The utility model relates to the technical field of leaching and defoaming, in particular to a defoaming device for the leaching process of iron-lithium black powder. Background Art

[0002] Foaming materials are common in industries such as chemical production, environmental protection facilities, pharmaceutical production, and petroleum refining. This foaming phenomenon is accompanied by severe entrainment of mist and foam. If the foam persists for too long and is difficult to break up in equipment such as reactors and storage tanks, it can lead to uneven material composition, hindering the equipment's production capacity and even causing it to cease operation. Lithium, a key component of new batteries, is highly valuable. Acid leaching is a common process in battery recycling. However, in actual production, excessively violent reactions often produce large amounts of foam, reducing leaching efficiency.

[0003] Currently, most commonly used defoaming methods are mechanical defoaming. For example, Chinese patent CN 214913618 U discloses a defoaming device for a leaching tank. This device uses a blower to remove most bubbles, and then uses an electric telescopic rod to drive a defoaming net up and down within the leaching tank to eliminate the remaining bubbles, achieving thorough defoaming and high defoaming efficiency. However, mechanical defoaming methods have the problem of re-foaming of the liquid phase after treatment, low defoaming efficiency, and high energy consumption. Utility Model Content

[0004] The purpose of this utility model is to overcome the above technical deficiencies and propose a defoaming device for the iron-lithium black powder leaching process to solve the technical problems in the mechanical defoaming method of the prior art, such as the liquid phase foaming again after treatment, low defoaming efficiency and high energy consumption.

[0005] In order to achieve the above technical purpose, the present invention adopts the following technical solutions:

[0006] The utility model provides a defoaming device for the leaching process of iron-lithium black powder, comprising:

[0007] Reactor;

[0008] an injection assembly comprising an injection mechanism and a liquid supply mechanism, wherein the injection mechanism is disposed at the inner top of the reactor and is used to inject the defoaming liquid, and the discharge port of the liquid supply mechanism is connected to the feed port of the injection mechanism and is used to pressurize the liquid supply; and

[0009] A cooling water component is arranged inside the reactor and is used for injecting cooling water.

[0010] In some embodiments, a stirring assembly is further included, which is arranged on the inner side of the reactor and is used to stir the fluid; the stirring assembly includes a drive shaft, a first stirring paddle and a second stirring paddle, the first stirring paddle and the second stirring paddle are both arranged on the drive shaft and are arranged up and down, the drive shaft is used to drive the first stirring paddle and the second stirring paddle to rotate, the first stirring paddle is used to stir the fluid from the inside to the outside, and the second stirring paddle is used to stir the fluid from the outside to the inside.

[0011] In some embodiments, the injection mechanism includes an annular flow equalizing tube and an injection tube, and several injection tubes are arranged in a circular distribution on the outside of the annular flow equalizing tube, and the discharge port of the liquid supply mechanism is connected to the annular flow equalizing tube at multiple points through a pipeline.

[0012] In some embodiments, the injection mechanism is arranged at one quarter of the reactor from the top.

[0013] In some embodiments, the reactor is provided with a plurality of overflow ports, and the overflow ports are arranged at the top of the reactor.

[0014] In some embodiments, the overflow port is further arranged between the first impeller and the injection assembly, and a valve is provided on the overflow port.

[0015] In some embodiments, a plurality of feeding pipes are provided on the top of the reactor.

[0016] In some embodiments, the cooling water assembly includes a water supply mechanism and a water injection pipe, and several of the water injection pipes are arranged on the top of the reactor and connected to the water outlet end of the water supply mechanism.

[0017] In some embodiments, a plurality of nozzles are provided at the bottom of the spray pipe, and the diameter of the nozzles is 1 cm.

[0018] In some embodiments, the overflow port is 20 cm above the first stirring paddle.

[0019] Compared with the prior art, the defoaming device for the leaching process of lithium iron phosphate black powder provided by the utility model arranges a spray assembly and a cooling water assembly in the reactor. Under the condition of intense reaction, while reducing the reaction heat, the defoaming liquid is chemically defoamed by covering spray, which effectively solves the foaming phenomenon caused by the reaction heat and gas generated by the waste lithium iron phosphate black powder during the reaction process. It is suitable for processing different types of waste lithium batteries, has a good operating environment, strong applicability, small footprint, low initial investment cost, and convenient later maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a front view of a defoaming device for the leaching process of iron-lithium black powder provided by an embodiment of the present utility model;

[0021] Figure 2 This is a left sectional view of a defoaming device for the leaching process of iron-lithium black powder provided by an embodiment of the present utility model;

[0022] Figure 3 This is a top view of a defoaming device for the leaching process of iron-lithium black powder provided by an embodiment of the present utility model;

[0023] Figure 4 It is a schematic structural diagram of the injection assembly of the defoaming device in the iron-lithium black powder leaching process provided by an embodiment of the present utility model.

[0024] Description of reference numerals:

[0025] 1. Reactor; 101. Overflow port; 102. Feed pipe; 2. Stirring assembly; 21. Drive shaft; 22. First stirring paddle; 23. Second stirring paddle; 3. Injection assembly; 31. Injection mechanism; 311. Annular flow equalizing pipe; 312. Injection pipe; 32. Liquid supply mechanism; 3201. Pipeline; 4. Cooling water assembly; 41. Water injection pipe. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] In order to solve the technical problems of mechanical defoaming, such as the re-foaming of the liquid phase after treatment, low defoaming efficiency and high energy consumption, the utility model provides a defoaming device for the leaching process of iron-lithium black powder, which can effectively control the reaction temperature and defoam.

[0028] It should be noted that the defoaming device for the iron-lithium black powder leaching process described in the present invention is used for but not limited to iron-lithium black powder leaching, etc. For the convenience of explanation, in the present invention, only the application of the defoaming device for the iron-lithium black powder leaching process to iron-lithium black powder leaching is taken as an example for explanation. The principle of applying the defoaming device for the iron-lithium black powder leaching process to bubbles in other types of reactors is essentially the same as the principle applied to iron-lithium black powder leaching, and will not be repeated here.

[0029] See also Figure 1-4 The utility model provides a defoaming device for the leaching process of iron-lithium black powder, which includes a reactor 1, a stirring component 2, a spray component 3 and a cooling water component 4. Lithium black powder is leached in the internal cavity of the reactor 1, and a black powder leaching reaction occurs inside the reactor 1. The reaction releases heat and there is H + 、F - 、SO4 2-etc.; the stirring component 2 is arranged on the inner side of the reactor 1, for stirring the fluid, mixing the materials and fully reacting; the injection component 3 includes an injection mechanism 31 and a liquid supply mechanism 32, the injection mechanism 31 is arranged on the inner top of the reactor 1, for spraying the defoaming liquid, the discharge port of the liquid supply mechanism 32 is connected to the feed port of the injection mechanism 31, for pressurized supply of the liquid, and the defoaming agent is provided to the injection component 3 through the liquid supply mechanism 32, above the liquid surface in the reactor 1, spraying downward, covering the bubbles generated on the liquid surface, and being able to quickly contact with the bubbles, low-concentration chemical defoaming agent, so that its molecules are widely distributed on the liquid surface, inhibiting the system from forming an elastic film, destroying and inhibiting the generation of foam; the cooling water component 4 is arranged on the inner side of the reactor 1, for injecting cooling water, the cooling water is room temperature pure water, which is used for dilution and cooling, reducing the reaction heat, thereby having the effect of slowing down the reaction heat and the foaming phenomenon caused by gas, and the superimposed injection component 3 sprays the defoaming agent, which can play a role in efficient defoaming.

[0030] In one embodiment, see Figure 2 In order to form a sufficient stirring effect, the stirring assembly 2 includes a drive shaft 21, a first stirring paddle 22 and a second stirring paddle 23. The drive shaft 21 is rotatably mounted on the reactor 1 and penetrates the interior of the reactor 1. The top of the drive shaft 21 is connected to the output shaft of the driving motor and is driven to rotate by the driving motor; the first stirring paddle 22 and the second stirring paddle 23 are both provided on the drive shaft 21 and are arranged up and down. The drive shaft 21 is used to drive the first stirring paddle 22 and the second stirring paddle 23 to rotate. The first stirring paddle 22 is used to move the fluid from the inside to the outside when stirring, and the second stirring paddle 23 is used to move the fluid from the outside to the inside when stirring, thereby forming a mixing and stirring effect of internal and external flow in the reactor 1, thereby improving the mixing degree between the materials.

[0031] In one embodiment, see Figure 4 In order to evenly cover the liquid surface of the reactor 1 when spraying the defoaming agent, the spraying mechanism 31 includes an annular flow balancing tube 311 and a spraying tube 312. Several of the spraying tubes 312 are circumferentially distributed and arranged on the outside of the annular flow balancing tube 311. The number of the spraying tubes 312 is set according to the required coverage density. In this embodiment, the number of the spraying tubes 312 is four. The discharge port of the liquid supply mechanism 32 is connected to the annular flow balancing tube 311 at multiple points through the pipe 3201. The connection points are set according to the number of the spraying tubes 312. In this embodiment, there are two connection points between the pipe 3201 and the annular flow balancing tube 311. The defoaming agent is supplied through the liquid supply mechanism 32 and is diverted to multiple points on the annular flow balancing tube 311 through the pipe 3201 for injection, and then evenly circulates to each spraying tube 312 to be sprayed towards the bubbles on the liquid surface of the reactor 1.

[0032] In this embodiment, the injection mechanism 31 is arranged at a quarter of the bottom of the reactor 1, so that it is suspended above the liquid surface of the reactor 1, but not too close to the liquid surface to avoid excessive bubbling speed that submerges the injection mechanism 31.

[0033] In this embodiment, a plurality of nozzles are provided at the bottom of the spray pipe 312. The nozzles have a diameter of 1 cm, so as to have a suitable spray flow rate.

[0034] It is understood that the liquid supply mechanism 32 can be a pressurized dispensing device, in which the defoaming agent is mixed with compressed air, and the compressed air is used to inject the defoaming agent. Specifically, the pressurized dispensing device includes a liquid storage tank, a compressed air system, a mixing chamber, and a delivery pipeline. The liquid storage tank is used to store the defoaming agent, and the compressed air system provides compressed air. The compressed air and defoaming agent are mixed in the mixing chamber, and the compressed air is used to move the liquid from the mixing chamber into the delivery pipeline and inject it into the injection mechanism 31. This is a prior art and will not be described in detail here. In addition, based on field experience, the gas-liquid ratio of the liquid supplied to the injection mechanism 31 can be adjusted. If the foam is easy to break, the amount of defoaming agent used can be reduced; if the foam is not easy to break, the amount of defoaming agent used can be increased.

[0035] In one embodiment, see Figure 2 The reactor 1 is provided with a plurality of overflow ports 101 , which are arranged at the top of the reactor 1 and are used for safe overflow when the liquid level is too high.

[0036] Furthermore, in order to reduce the impact of the defoaming agent liquid on the reaction, the overflow port 101 is also arranged between the first stirring paddle 22 and the injection assembly 3, and a valve is provided on the overflow port 101. The valve of the overflow port 101 can be opened to remove the defoaming agent liquid in the reactor 1, thereby reducing the adverse impact of the defoaming agent liquid on the material quality.

[0037] Specifically, the overflow port 101 is 20 cm above the first stirring paddle 22 .

[0038] In one embodiment, see Figure 2 and Figure 3 The top of the reactor 1 is provided with several feeding pipes 102 for feeding the reactor and adjusting the reaction rate. Each feeding pipe 102 is used to add auxiliary materials such as base acid, battery black powder, concentrated acid or hydrogen peroxide. The separate feeding pipe 102 makes it easy to control the proportion of each raw material separately.

[0039] In one embodiment, see Figure 2The cooling water assembly 4 includes a water supply mechanism and a water injection pipe 41. Several water injection pipes 41 are arranged on the top of the reactor 1 and connected to the water outlet end of the water supply mechanism. The water supply mechanism can use a water pump to pump pure water and inject it into the reactor 1 through the water injection pipe 41.

[0040] In order to better understand the present invention, the following Figures 1 to 4 The technical solution of the utility model is described in detail: the reactor 1 is opened, the stirring component 2 is started, the first stirring paddle 22 and the second stirring paddle 23 are both started to rotate, the base acid is added, and then the battery black powder is added. After completion, a certain proportion of concentrated acid is added, and at the same time, auxiliary materials such as hydrogen peroxide are added in appropriate amounts; when the reaction is intense, heat is released violently, and bubbles are generated, the addition of acid, hydrogen peroxide and other auxiliary materials that promote the reaction is stopped, and the injection component 3 and the cooling water component 4 are opened at the same time. The cooling water is pure water at room temperature for dilution and cooling; the injection component 3 is adjusted according to field experience. 3 spray material liquid gas ratio, if the foam is easy to break, reduce the use of defoaming agent, if the foam is not easy to break, increase the use of defoaming agent; at the same time, the middle overflow port 101, that is, the overflow port 101 located 20 cm above the first stirring paddle 22, can be opened to remove the liquid of the material in the reactor 1; the reaction heat and gas generated by the waste lithium iron phosphate black powder in the reaction process are effectively solved, and the foaming phenomenon caused by the gas is suitable for processing different types of waste lithium batteries. It has a good operating environment, strong applicability, small footprint, low initial investment cost, and convenient later maintenance.

[0041] The specific embodiments of the present invention described above do not limit the scope of protection of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A defoaming device for the leaching process of iron-lithium black powder, characterized in that: include: Reactor; an injection assembly comprising an injection mechanism and a liquid supply mechanism, wherein the injection mechanism is disposed at the inner top of the reactor and is used to inject the defoaming liquid, and the discharge port of the liquid supply mechanism is connected to the feed port of the injection mechanism and is used to pressurize the liquid supply; and A cooling water component is arranged inside the reactor and is used for injecting cooling water.

2. The defoaming device for the leaching process of iron-lithium black powder according to claim 1, characterized in that: It also includes a stirring assembly, which is arranged on the inner side of the reactor and is used to stir the fluid; the stirring assembly includes a drive shaft, a first stirring paddle and a second stirring paddle, the first stirring paddle and the second stirring paddle are both arranged on the drive shaft and are arranged up and down, the drive shaft is used to drive the first stirring paddle and the second stirring paddle to rotate, the first stirring paddle is used to stir the fluid from the inside to the outside, and the second stirring paddle is used to stir the fluid from the outside to the inside.

3. The defoaming device for the leaching process of iron-lithium black powder according to claim 2, characterized in that: The injection mechanism includes an annular flow equalizing pipe and an injection pipe. Several injection pipes are arranged in a circumferential distribution outside the annular flow equalizing pipe. The discharge port of the liquid supply mechanism is connected to the annular flow equalizing pipe at multiple points through a pipeline.

4. The defoaming device for the leaching process of iron-lithium black powder according to claim 3, characterized in that: The injection mechanism is arranged at a quarter of the reactor from the top.

5. The defoaming device for the leaching process of iron-lithium black powder according to claim 4, characterized in that: The reactor is provided with a plurality of overflow ports, and the overflow ports are arranged at the top of the reactor.

6. The defoaming device for the leaching process of iron-lithium black powder according to claim 5, characterized in that: The overflow port is also arranged between the first stirring paddle and the injection assembly, and a valve is provided on the overflow port.

7. The defoaming device for the leaching process of iron-lithium black powder according to claim 6, characterized in that: A plurality of feed pipes are provided on the top of the reactor.

8. The defoaming device for the leaching process of iron-lithium black powder according to claim 7, characterized in that: The cooling water assembly includes a water supply mechanism and a water injection pipe. Several water injection pipes are arranged on the top of the reactor and connected to the water outlet end of the water supply mechanism.

9. The defoaming device for the leaching process of iron-lithium black powder according to claim 8, characterized in that: The bottom of the spray pipe is provided with a plurality of nozzles, each having a diameter of 1 cm.

10. The defoaming device for the leaching process of iron-lithium black powder according to claim 9, characterized in that: The overflow port is 20 cm above the first stirring paddle.

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